package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品、新增菜品对应的口味
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        // 向菜品表插入1条数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        log.info("插入菜品数据：{}", dish);
        dishMapper.insert(dish);
        // 获取新增菜品的Id
        Long dishId = dish.getId();

        // 向口味表插入n条菜品id相同的数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        log.info("插入口味数据：{}", flavors);
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(flavor ->{
                flavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        // 判断菜品能否删除
        // 1. 起售中的不能删
        // 2. 与套餐有关联的不能删
        Iterator<Long> iterator = ids.iterator();
        Boolean dishOnSale = false;
        Boolean dishRelatedBySetmeal = false;
        while(iterator.hasNext()){
            Dish dish = dishMapper.getById(iterator.next());
            List<Long> setmealIds = setmealMapper.getSetmealIdsByDishIds(ids);
            if(dish.getStatus()== StatusConstant.ENABLE){
                dishOnSale = true;
                iterator.remove(); // 移除最后访问的元素，即状态为起售的菜品
            }else if(setmealIds != null && setmealIds.size() > 0){
                dishRelatedBySetmeal = true;
                iterator.remove();
            }
        }

        // 删除菜品
        // 1. 删除菜品对应的口味
        // 2. 删除菜品
        if(ids == null || ids.size() == 0){
            if(dishOnSale && dishRelatedBySetmeal){
                throw new DeletionNotAllowedException(MessageConstant.DISH_DETELE_ERROR);
            }else if(dishOnSale){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }else if(dishRelatedBySetmeal){
                throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
            }
        }

        for(Long id : ids){
            dishFlavorMapper.deleteByDishId(id);
            dishMapper.deleteById(id);
        }
    }

    /**
     * 编辑菜品和对应的口味
     * @param dishDTO
     */
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        // 准备数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        List<DishFlavor> flavors = dishDTO.getFlavors();
        Long dishId = dish.getId();
        // 先删除旧口味数据，再插入新口味
        dishFlavorMapper.deleteByDishId(dishId);
        // 传输过来的flavors中没有dishId，要先set
        if(flavors != null && flavors.size() >0){
            flavors.forEach(flavor -> {
                flavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(flavors);
        }
        // 更新dish
        dishMapper.update(dish);
    }

    /**
     * 根据id查询菜品
     * @param id
     * @return
     */
    public DishVO queryById(Long id) {
        Dish dish = dishMapper.getById(id);
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> queryByCategoryId(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .build();
        List<Dish> dishes = dishMapper.list(dish);
        return dishes;
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    /**
     * 起售/停售商品
     * @param status
     * @param id
     */
    public void enableOrDisable(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
    }
}
